Fan



FIG. 1 is a front perspective view of a fan showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line areas in FIG. 7 are included for the purpose of showing environmental subject matter and form no part of the claimed design. 

The ornamental design for a fan, as shown and described. 